Pressure drop in the compressed air cylinder?

[mad_matty]

Hello everybody,

if you have a compressed air tank (200 liters / 1.3 bar) on the water surface and dive at a depth of 3 meters with a hose and a regulator, how long can you dive if you consume 32.5 liters / min?

What is the minimum pressure of the compressed air tank?
How does the pressure develop in the tank when I breathe?
What would be the limit pressure?

Cheers

Matthias

 

[tbone1004]

short answer is you can't. 1.3bar is not enough of a pressure differential for a regulator to work since ambient pressure at 3m is 1.3bar

 

[Jonny Wishbone]

I may be speaking for others here too when I say these questions are a bit weird but if you give more details of what you are trying to do maybe we can provide better answers for you...If you were diving a Hooka Rig at 3m/10ft you can run it dry/empty and come up exhaling your last breath. The limit pressure is dictated by the tanks rated working pressure. Pressure does not develop in the tank when you breath, it decreases as you use the air by breathing via your regulator. Minimum air tank pressure at 10ft/3m depends on the regulator you are using. Some will let you suck a tank almost dry and some will give you symptoms at a few hundred psi. I think more info is needed so please explain further...

 

[Diver0001]

Hello everybody,

if you have a compressed air tank (200 liters / 1.3 bar) on the water surface and dive at a depth of 3 meters with a hose and a regulator, how long can you dive if you consume 32.5 liters / min?

What is the minimum pressure of the compressed air tank?
How does the pressure develop in the tank when I breathe?
What would be the limit pressure?

Cheers

Matthias

Matthias, what is the question behind the question? What do you REALLY want to know?

R..

 

[JohnN]

Hello everybody,

if you have a compressed air tank (200 liters / 1.3 bar) on the water surface and dive at a depth of 3 meters with a hose and a regulator, how long can you dive if you consume 32.5 liters / min?

What is the minimum pressure of the compressed air tank?
How does the pressure develop in the tank when I breathe?
What would be the limit pressure?

Cheers

Matthias

For those of us still enjoying the "furlongs per fortnight" system of weights and measures, 200 liters is about the size of a 50 gallon barrel. . . I think something was lost in presenting the question. . .

 

[hroark2112]

Tuesday, because motorcycles have red doors.

 

[RainPilot]

I suspect this is a homework assignment, kudos for original thought in getting actual scuba divers to help....

Ignoring the mechanics of the regs etc, 200 litres at 1.3 bar means the tank is the same pressure as the ambient at 3m (1.3ATA)

That means that at 3m you will not be able to breathe off a non-deformable tank that is at 1.3 bar.

 

[АлександрД]

If you have NO regulator, and will use HARD 200L 1.3 bar tank on the surface - does not matter, what SAC you have.
You will be able to make no more than ONE breath, because pressure at 3m is 1.3 bar.
After one breath pressure in the tank will LESS than pressure at the depth of 3m, and you will have to suck air from this tank, and this is not good for your lungs.

P.S. When I writing this post, RainPilot already described this

P.P.S.
this cylinders?